RU164494U1 - METAL POLYMER ROPE - Google Patents

Abstract

1. Metal polymer cable containing a core made of coated metal threads and a polymer shell, characterized in that the core consists of strands interconnected by a strand, which, in turn, consist of interconnected steel strands of high-carbon steel grades coated with non-ferrous metals, and has cavities for connection with a colored or transparent polymer shell with a relative elongation of at least 20%, and the tensile strength of the metal-polymer cable is calculated by in the empirical formula, where Rmt is the breaking strength of the metal-polymer cable; Pc is the breaking strength of the core; n is the number of threads in the core; f is the loss factor = 1.12.2. The metal-polymer cable according to claim 1, characterized in that the polymer shell is made with the possibility of adding photophosphors or glitter to it.

Description

The utility model relates to the structural features of ropes, in particular to the design and manufacture of metal-polymer cables. The metal-polymer cable is widely used in the national economy as a fastening element for many structures: mast extensions, fastening of awnings of vehicles, cables, trellises of vineyards and other fruit and berry crops, pendants for signs and other elements; as a transmitting force from one element to another: emergency stop of the conveyor and much more.

A known construction of a cable made of metal threads and manufactured by the method of double twisting of metal threads [1].

The disadvantage of this cable design is its low corrosion resistance.

Closest to the technical nature of the claimed device, is the design of the cable, consisting of a core of metal filaments with a coating and a polymer sheath of the class PVC (polyvinyl chloride). At least one of the threads of the core has a coating, mainly of brass [2].

However, the known technical solution (prototype) does not have sufficient operational and consumer characteristics. The design of the cable has an insufficiently strong connection of the core with the sheath. One thread or several threads from a brass coating of a multi-core core does not allow ensuring corrosion resistance in general of all core elements and effective adhesion of the core to the shell. PVC sheath does not take into account the extension of the core and is destroyed when significant loads are applied to the cable. This material also does not always provide resistance to alkalis, acids, radiation, and temperature.

The objective of the utility model is to improve the operational and consumer characteristics of the product, increase the strength of the connection of the core with the shell and its corrosion resistance, as well as expand the range of products to more fully meet the needs of consumers.

The problem is solved by developing a new design of a cable containing a metal core, consisting of strands fastened together by a strand, which in turn consists of strands (wires) fastened together by a strand of high-carbon steel grades coated with non-ferrous metals, and the strands have hollows for compounds with a colored or transparent polymer shell with a relative elongation of at least 20%. and the possibility of adding photophosphors or gliter to it. The strength characteristics of the cable, taking into account the negative impact of mechanical stresses on the core during its operation, are determined by calculating the breaking strength of the metal-polymer cable according to the empirical formula:

where: РМТ - breaking strength of a metal-polymer cable;

Pc is the breaking force of the core;

n is the number of threads in the core;

f - coefficient of loss of strength = 1.12

The technical result is to improve the operational and consumer characteristics of the product, increasing the strength of the connection of the core with the shell and its corrosion resistance, obtained due to the new design of the cable, the use of new materials.

The new cable design contains one core consisting of strands interconnected by a strand, which in turn consist of strands (wires) interconnected by a strand of high-carbon steel grades coated with non-ferrous metals (zinc, brass), and the strands have hollows for compounds with a colored or transparent polymer shell with a relative elongation of at least 20%. and the possibility of adding photophosphors or gliter to it.

A core made in this way can be considered as a coil spring intended for energy storage. The length of the core stretching depends on the number of turns, the pitch of the twist, the diameter of the wire, the maximum perceived load. Moreover, both individual strands and the core as a whole, twisted from strands, possess such properties. A coiled cylindrical tension spring, elastically deformable along the axis, has a stiffness coefficient

,

,

where: d _D is the diameter of the wire;

d _F - winding diameter (measured from the axis of the wire);

n is the number of turns;

G is the shear modulus (for ordinary steel G≈80 GPa).

This core with springy properties allows to reduce the diameter of the wires or their number in comparison with the prototype for the same loads. This leads to a decrease in mass per unit length of the cable and increases the flexibility of the hummock.

The manufacture of the core as a whole from steel wires coated with non-ferrous metals (zinc, brass) can improve the corrosion properties of the core compared to the prototype. In addition, the coating of non-ferrous metals (zinc, brass) allows you to increase the adhesion of the core to the polymer. That, given the fact that the core has depressions for connection with the polymer shell, leads to an increase in the strength of the connection of the core with the shell. In order to prevent destruction of the polymer shell during core lengthening, the polymer shell is made with a relative elongation of at least 20%. The strength characteristics of the cable are calculated taking into account the negative impact of mechanical stresses on the core during its operation by calculating the breaking strength of the metal-polymer cable according to the empirical formula (1).

To improve the operational and consumer characteristics of the product for the manufacture of shells, colored or transparent polymers are used with the possibility of adding photoluminophores or gliter.

The design of the metal-polymer cable is shown in figures 1, 2, 3.

In FIG. 1 shows a cross section of a metal polymer cable, where it is indicated:

pos. 1 - a metal core in the form of a cable from twisted strands;

pos. 2 - core strands from twisted together threads (wires) of high-carbon steel grades coated with non-ferrous metals;

pos. 3 - filaments (wire) of high carbon steel grades coated with non-ferrous metals;

pos. 4 - hollows between threads (wires);

pos. 5 - polymer shell.

In FIG. 2 shows a section of the polymer sheath of a metal-polymer cable, which shows:

pos. 3 - filaments (wire) of high carbon steel grades coated with non-ferrous metals;

pos. 4 - hollows between threads (wires) filled with polymer;

pos. 5 - polymer shell.

In FIG. 3 shows a photograph of a polymer cable.

The metal-polymer cable is structurally made of a metal core 1, containing strands interconnected by a strand 2. And the strands, in turn, consist of interconnected strands of steel filaments (wires) 3 coated with non-ferrous metals, forming depressions 4 filled with a shell polymer 5.

The core 1 is made of high carbon steel grades coated with non-ferrous metals, which prevents steel corrosion. The corrosion and oxidation of the metal core 1 is also prevented by the polymer shell 5.

The core load of the metal-polymer cable can withstand the core 1, which, when applied to the cable, is lengthened by the strands of strands 2 and the strands of strands (wires) 3. The shell polymer has a relative elongation of at least 20%. This relative elongation does not allow the destruction of the polymer shell 5 when the core 1 is stretched.

The metal polymer cable is made in two stages:

Stage 1 - manufacturing of core 1;

Stage 2 - applying to the core 1 layer of polymer (transparent, colored, with glitter, with a fluorescent substance), forming a protective shell 5 with the necessary operational, consumer, technical characteristics.

The core is made on a twisting or litsekrutilny machine by twisting steel threads 3 coated with non-ferrous metals in a developed design with a given diameter. In the installation for manufacturing a metal-polymer cable, a layer of the selected polymer type is deposited on the metal core 1 by molten extrusion, which fills the depressions 4 of core 1. Then, when cooled, the polymer hardens, forms a strong connection with threads 3. In this way, a protective sheath 5 is made.

The metal-polymer cable of Tanis CJSC passed laboratory climatic tests at the State Scientific Institution “V.A. Institute of Mechanics of Metal-Polymer Systems Belyi National Academy of Sciences of Belarus, showing its high operational and consumer properties with an estimated service life of up to 25 years. The coating is resistant to solar radiation, precipitation, temperature changes in the range from -40 ° C to + 110 ° C.

The main technical, operational and consumer characteristics of a metal polymer cable are: core material, polymer material, metal polymer cable diameter; core diameter; tensile strength of the cable indicated in the following tables.

To better meet the needs of consumers in the polymer cable, which has found wide application in the national economy and is intended for: stretching the masts of television antennas and tent structures; installation of information plates and advertising banners, lighting systems, fencing systems; use in equipping greenhouses and greenhouses; use as a support cable for laying overhead cable lines; use as a linen cord; trellis formation in horticulture and viticulture; equipment for emergency shutdown systems of the conveyor and other mechanisms; in sealing systems; fixing car tents; use on flagpoles, trainers, shutters; stretch tennis, volleyball and protective nets; use for immersion of pumps in non-food liquids; use in wells when lifting containers with cold water; decorative and design purposes in the manufacture of various products for a wide range of purposes; other purposes at the discretion of the consumer, the applicant has developed a wide range of products, presented in the following tables:

PR group (core - steel wires with brass coating, polymer - polyvinyl chloride)

PRL group (core - steel wires with brass coating, polymer - polyvinyl chloride with phosphor)

PRG group (core - steel wires with brass coating, polymer - polyvinyl chloride with gliter)

PRF group (core - steel wires with a brass coating, polymer - polyvinyl chloride with a color fluorescent coating

Group PRSh (core - steel wires with brass coating, polymer -

polypropylene)

PRPL group (core - brass coated steel wires, polymer-polyurethane)

PRO group (core - galvanized wires, polymer - polyvinyl chloride)

PRPO group (core - galvanized wires, polymer - polyurethane)

PRIO group (core - galvanized wires, polymer - polypropylene with wear-resistant properties)

PRIL group (core - steel wires with brass coating, polymer - polypropylene with wear-resistant properties)

PRMPL group (core - brass coated steel wires, polymer - frost-resistant thermoplastic polyvinyl chloride)

PRMO group (core - galvanized wires, polymer - thermoplastic frost-resistant polyvinyl chloride)

PRSL group (core - steel wires with brass coating, polymer - polyamide)

PRSO group (core - galvanized wires, polymer - polyamide)

The operation of the metal-polymer cable is considered on the example of industrial testing of trellis for grapes made from a cable of the PRSh group. The tests were carried out in Moldova (LLC AgroSadym).

Supporting posts are installed along the edges of the vineyard and along its length, to which the metal-polymer cable for trellises is fixedly attached. Planted vines of grapes are attached to the metal polymer rope for trellis.

With the growth of grapes, its green mass and the mass of ripening fruits increase, leading to an increase in the load on the metal-polymer cable. The resulting tensile deformations are compensated by the springy properties of the core 1 of the metal-polymer cable formed by twisting together several strands 2, which in turn are twisted from steel threads (wires) 3 of high-carbon steel grades. In addition, the cable-grape system is exposed to wind, causing longitudinal-transverse and twisting deformations, which are also compensated by the springy properties of the core 1 of the metal-polymer cable, formed by twisting together several strands 2, which in turn are twisted from steel threads (wires) 3 of the high carbon steel grades.

On a grape field, the metal polymer cable for trellis is exposed to the sun, wind, rain, irrigation and fertilizer of the vineyard, causing thermal, chemical, radiation effects on the polymer shell of the metal polymer cable for trellis. To prevent the destruction of the protective polymer shell from these effects, modified polypropylene is used as polymers, which is highly resistant to ultraviolet radiation, atmospheric precipitation, temperature extremes, acids and alkalis.

Industrial tests have shown high operational and consumer qualities of metal-polymer cable for trellis manufactured by ZAO Tanis.

According to this utility model, the metal-polymer cable successfully combines the properties of a core consisting of strands interconnected by a strand, which in turn consist of interconnected strands of steel filaments of high-carbon steel grades coated with non-ferrous metals, withstand various kinds of loads and having less weight in comparison with the prototype with effective protective and consumer properties of the polymers used.

[1] Polytechnical dictionary. - M.: Soviet Encyclopedia, 1976 - p. 197 (analog).

[2] Description of the utility model for patent RU 48538, (45) 10.27.2005 (prototype).

Claims (2)

1. Metal polymer cable containing a core made of coated metal threads and a polymer shell, characterized in that the core consists of strands interconnected by a strand, which, in turn, consist of interconnected steel strands of high-carbon steel grades coated with non-ferrous metals, and has cavities for connection with a colored or transparent polymer shell with a relative elongation of at least 20%, and the tensile strength of the metal-polymer cable is calculated by empirical formula

, where РМТ - breaking strength of a metal-polymer cable; Pc is the breaking force of the core; n is the number of threads in the core; f is the coefficient of loss of strength = 1.12. 2. The metal polymer cable according to claim 1, characterized in that the polymer shell is made with the possibility of adding photoluminophores or glitter to it.

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